CRYSTAL™
CRYSTAL Geology
Geological modeling of key reservoir properties such as porosity, permeability and fracture density is the key to a better understanding of the reservoir. This enhanced understanding can be achieved by building 3D models that simultaneously use log and seismic data. The user can edit, QC, and create discrete and continuous logs that can be correlated among the available wells and mapped in 3D. Using the numerous high resolution seismic attributes, continuous or discrete reservoir properties could be modeled with either geostatistical methods or neural networks. All the geologic models are built using geocellular grids that account for any complex stratigraphic setting and that are ready for simulation by offering regular rectangular gridblocks with vertical columns. The tools provided to upscale the geologic models or to condition them to well test data enable the reservoir engineer to focus on reservoir development strategies, rather than wasting time with lengthy history matching processes. All these functionalities are achieved with the following modules.
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Petrophysics |
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Prior to any modeling effort, this module allows the user to QC, edit and create new logs that are relevant to the reservoir modeling effort. |
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Well Correlation |
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To better understand the stratigraphy of the reservoir and its layering, this module allows the user to build well correlations that will assist the geologist in modeling. To better establish these well correlations, key seismic attributes which provide interwell information are used with the known well data. |
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Variogram and Statistical Analysis |
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Provides the necessary tools to examine the lateral and vertical correlations of well and seismic data. |
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Property Modeling Using Geostatistics |
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Various geostatistical methods will allow the user to combine the variograms with the well and seismic attributes to create both continuous and discrete models. CRYSTAL geostatistics includes proprietary algorithms that are extremely fast, and the resulting models are able to reproduce exactly the statistics of the input variograms. For permeability modeling, CRYSTAL provides a true cloud transform method that guarantees the ability to reproduce any complex Permeability-Porosity relationship. |
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Property Modeling Using Neural Networks |
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Given the availability of multiple high resolution seismic attributes, CRYSTAL provides the necessary artificial intelligence tools to create continuous and discrete property models constrained to multiple seismic attributes. |
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Fracture Modeling |
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When dealing with fractured reservoirs, CRYSTAL provides seismic, geologic, and geomechanical attributes, which are all used simultaneously in the Continuous Fracture Modeling (CFM) approach. The CFM technology can use any fracture indicator at the wells - it is not limited to image logs. The fracture indicators at the wells are correlated with the numerous seismic, geologic and geomechanical drivers to produce an accurate fracture model. The CFM technology is the only fracture modeling technique that proved with the drill bit its ability to predict fractures at undrilled location with a vertical resolution of 1-3 meters. Once a CFM model is available, it could be used to create a constrained DFN (Discrete Fracture Network). Most importantly, the CFM model could be calibrated to well test data to provide an accurate fracture permeability that has proven in reservoir simulators to provide a good match of individual well performances. |
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Prism
Seismic Inc.
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6595 S. Dayton St. Suite 2600
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Greenwood Village CO 80111
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Tel:1+720-488-0006
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